Chapter 2 Strain
Mechanics of MaterialsChapter Introduction So far dealt mainly with thestrengthof structural member. Here we being our study of an equally important topic of mechanics deformations, orstrains. In general terms, strainis a geometric quantity that measures thedeformation of a body. There are two types of Strain normal Strain , which characterizes dimensional changes, and shear Strain , which describes distortion (changes in angles). stress and strainare twofundamental concepts of mechanics of materials. Their relationship to each other defines the mechanical properties of a material, the knowledge of which is of the utmost importance in design.
Figure 2.4 Stress-strain diagrams for various materials that fail without significant yielding. ( )2003 k /C l bli hi / h i However, the phenomenon of yielding is unique to structural steel. Other grades of steel, steel alloys, and other material do not yield, as indicated by the stress-strain curves of the materials shown in Fig.2.4..
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